VSC8221 datasheet(129/138 Pages) MICROSEMI

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VSC8221

Data Sheet

VMDS-10106 Revision 4.1

December 2006

129 of 132

132

31.8 Clause 40 Auto MDi/MDi-X interoperability Testing

Description: The VSC8221 device’s Auto MDi/MDi-X will not pass the UNH iOL’s Clause 40 Auto-crossover test suite.

impact: Although the VSC8221 will not technically pass the entire Auto MDi/MDi-X test suite at the UNH iOL, extensive Auto

MDi/MDi-X interoperability testing has been performed in Microsemi’s internal interoperability lab, in addition to performing

standard interoperability testing at the UNH iOL. Due to the robust Auto MDi/MDi-X implementation in the VSC8221, there are

no known interoperability issues with Auto MDi/MDi-X at any speed. Please contact Microsemi for additional interoperability and

validation results, including the UNH iOL Test Report.

Workaround: None.

31.9 10BASE-T HDX issue with iXiA Test Suite

Description: A jam signal generated by an iXiA tester and sent to the VSC8221 in 10BASE-T HDX cannot be seen by a

receiving MAC. When a jam signal of 0xFF is generated by an iXiA test suite and transmitted at the start of the packet, the PHY

does not report any receive information on its SGMii interface. in SGMii, carrier sense in the MAC is derived from TX_DX, so the

MAC is not able to detect a collision.

impact: The only known situation that could be affected by this issue is if a receive error corrupts the entire preamble. Extensive

testing has only shown this error to occur when used with an iXiA tester. This error has not occurred in interoperability testing.

Workaround: None.

31.10 100BASE-FX initialization Script

The 100BASE-FX initialization script does the following:

• initializes the copper section of DSP to support the 100BASE-FX mode

• Disables the pair swap option

• Sets 100BASE-X PCS into FX mode

• Forces the PHY into 100Mbps mode

The following script is provided as an attached text file so that you can copy it electronically. in Acrobat, double-click the

attachment icon.

//--100BASE-FX initialization script for VSC8221.--//

phy_write( phynum(dec), regnum(dec), value(hex) );

phy_write(0, 31, 0x2a30);

phy_write(0,

8, 0x0212);

phy_write(0, 31, 0x52b5);

phy_write(0,

0, 0xa7fa);

phy_write(0,

2, 0x0012);

phy_write(0,

1, 0x3001);

phy_write(0,

0, 0x87fa);

phy_write(0, 31, 0x52b5);

phy_write(0,

0, 0xa240);

VSC8221 Datasheet(PDF) 129 Page - Microsemi Corporation

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